Fig. 4

Co-occurrence network diagram at bacterial genus level in CP (A) and CK (B) composting. Co-occurrence network diagrams are colored by the bacterial phyla and key taxa, respectively. The red line is a positive correlation, and the blue line is a negative correlation. The node is a genus, and the width of the line means the degree of correlation. It can be seen from the figure that the addition of corn pulp improves the connectivity between nodes and reduces the complexity of the network diagram. Meanwhile, it is found that the positive correlation rate among the flora increases after the addition of corn pulp, which promotes the complementarity effect of the flora, which may be related to the transformation of carbon and nitrogen